Recover original message count in check_tx_events

[romac]

Summary

From #2334 (comment)

I also want to note that there is still one call in Link that returns a single ChainError event. In this case the original message count is lost in translation, so it is not possible to fill in the error events with the original count. This in turn means that the RelaySummary returned would still have only one error event.

Problem Definition

TBD

Proposal

TBD

Acceptance Criteria

TBD

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned